Lo-D SR-5100

Commentary

AM/FM receiver combining 25W + 25W audio section and 1.9 μ V high sensitivity tuner.

We have achieved low distortion and high S/N by using Hitachi's proprietary transistors and ICs for the power amplifier and by adopting a grounded emitter-grounded inverted Darlington pure complimentary service OCL circuit.

The equalizer stage of the nf is applied to the equalizer stage of the preamplifier section by ± 2 power supply and 3-stage directly connected monolithic IC, and low distortion rate characteristics are realized over the whole band.

The FM tuner uses a 3-row varicon and a dual-gate MOS-FET front-end, and a full-scale circuit configuration that combines a high-integration IC, an IF circuit with a 4-element phase linear ceramic filter, and quadrature detection.
By adopting double-balanced differential switching for the MPX demodulation circuit, excellent separation characteristics are realized.

Equipped with an FM muting switch.

Linear scale FM memory is adopted.

It is equipped with 2 types of tape input and can be dubbed.

Equipped with a microphone mixing circuit.

Model Rating

Type	FM/AM Receiver
Power Amplifier Unit
Effective power	Both channel drive : 25W + 25W (8 Ω, 1 kHz) 30W + 30W (4 ω, 1 kHz) Single-channel Drive : 28W/28W (8 Ω, 1 kHz) 38W/38W (4 Ω, 1 kHz)
Dynamic Power (IHF)	70W (8 Ω)
Total harmonic distortion factor	0.8% or Less (Actual Output) 0.1% or Less (at 1/2 Effective Output)
Cross modulation distortion factor	0.8% or Less (Actual Output) 0.1% or Less (at 1/2 Effective Output)
Output Bandwidth (IHF)	10 Hz to 60 kHz
Damping factor	30 (1 kHz, 8 Ω)
Preamplifier Section
Input Sensitivity / Impedance	Phono : 2.5mV/50k Ω Aux : 200mV/100k Ω Tape : 200mV/35k Ω Mic : 7mV/30k Ω
Phono maximum allowable input	100 mV (RMS, 1 kHz)
SN ratio (IHF-A, input short)	Phono : 65 db (73 db in the 1975 catalog) Aux, Tape PB : 78 dB
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
Loudness contour (at Volume-30dB)	+ 9 dB (100 Hz), + 5 dB (10 kHz)
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Practical sensitivity (IHF)	1.9 μ V
Capture ratio	1.0dB
Effective selectivity	52dB
S/N	67dB
Total harmonic distortion factor	mono:0.3% stereo:0.6%
Stereo separation	41dB(1kHz)
<AM Tuner Section>
Receiving frequency	520 kHz to 1,605 kHz
Practical sensitivity (IHF)	20 μ V
Selectivity	35dB
Image interference ratio	56dB
<General>
Semiconductor used	Transistor : 16 FET : 1 IC : 5 Diode : 23 (25 in 1975 catalog)
Power supply voltage	100 VAC, 50Hz/60Hz
Rated power consumption	65W (Electrical Appliance and Material Control Law)
External dimensions	Width 413x Height 136x Depth 376 mm
Weight	8.2kg